js做的计算器

来源：互联网发布：穆迪埃cba数据编辑：程序博客网时间：2024/06/08 11:20

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>js加减乘除计算器代码</title>
<style>
body,ul{ margin:0px; padding:0px;}
body{ background:#AF6332}
li{ list-style:none;}
.fl{ float:left;}
.fr{ float:right;}
.clearfix:after{ content:""; display:block;clear:both}
.clearfix{zoom:1;}
/*是用inset可以将外部阴影改成内部阴影;若要实现内外阴影同时存在，将其并在一行用逗号隔开*/
.calBox{ width:460px; padding-bottom:10px;background:#FDFDFD; border-radius:5px; position:absolute; left:50%; top:50%; margin-left:-230px; margin-top:-225px; box-shadow:0px 0px 10px rgba(0,0,0,0.8),0px 0px 10px rgba(0,0,0,0.5) inset; -webkit-box-shadow:0px 0px 10px rgba(0,0,0,0.8),0px 0px 10px rgba(0,0,0,0.5) inset; background:#F9F9F9; overflow:hidden}
input{ width:406px; height:82px; margin:10px 7px 0px; border-radius:5px; border:1px solid #64655F; box-shadow:0px 5px 2px rgba(157,157,145,0.8) inset; -webkit-box-shadow:0px 5px 2px rgba(157,157,145,0.8) inset; outline:none; background:#FCFDEB; text-align:right; font-family:"微软雅黑"; font-size:40px; padding:0px 10px;}
ul{}
li{ list-style:none; width:74px; height:34px; line-height:34px; text-align:center; font-family:"微软雅黑"; border:1px solid #8B8B8B; border-radius:5px; background:url(/jscss/demoimg/201402/calBg) repeat-x; float:left; margin:12px 6px 0px;}
.one li{ height:44px; background:url(/jscss/demoimg/201402/calBg1.jpg) repeat-x; line-height:44px;cursor:pointer;}
.one .orange{ background:url(/jscss/demoimg/201402/calBg2.jpg) repeat-x; border:1px solid #875733;}
.one .black{ background:url(/jscss/demoimg/201402/calBg3.jpg) repeat-x; border:1px solid #363636; color:#fff;}
.one .gray{ background:url(/jscss/demoimg/201402/calBg4.jpg) repeat-x; border:1px solid #5F6366;}
.zero{ width:160px;}
.one .deng{ background:url(/jscss/demoimg/201402/calBg5.jpg); height:100px;}
.twoBox{ width:353px; overflow:hidden; }
.two{ width:358px;}
.calBox .three { margin:0px}
.calu{ padding:0px 10px; width:470px;}
</style>
<script type="text/javascript">
function findArr(a,c){for(var b=0;b<a.length;b++){if(a[b]==c){return true}}return false}function getClass(d,f){if(document.getElementsByClassName){return d.getElementsByClassName(f)}else{var a=[];var e=document.getElementsByTagName("*");for(var c=0;c<e.length;c++){var b=e[c].className.split(" ");if(findArr(b,f)){a.push(e[c])}}return a}};
window.onload=function()
{
   var aNum=getClass(document,'num');
   var oText=document.getElementById('text');
   var aPer=getClass(document,'oper');
   var oPer=document.getElementById('per');
   var oText1=document.getElementById('text1');
   var oDeng=getClass(document,'deng')[0];
   var oSq=getClass(document,'sq')[0];
   var oRec=getClass(document,'rec')[0];
   var oZheng=getClass(document,'zheng')[0];
   var oOn=getClass(document,'on')[0];
   var oOff=getClass(document,'off')[0];
   var oClea=getClass(document,'clea')[0];
   var bOnOrOffClick=false;
   function fnNum(a)
   {
       var bClear=false;
       oText.value='0'
       for(var i=0;i<aNum.length;i++)
       {
           aNum[i].onclick=function()
           {
               if(!bOnOrOffClick)return;
               if(bClear)
               {
                   bClear=false;
               }
               if(oText.value.indexOf('.')!=-1)
               {
                   if(this.innerHTML=='.')
                   {
                       return;
                   }
               }
               if(oPer.value&&oText.value&&oText1.value=='')
               {
                   oText1.value=oText.value;
                   oText.value='';
               }
               var re=/^0\.{1}\d+$/;
               var re1=/^([0]\d+)$/;
               oText.value+=this.innerHTML;
               if(re.test(oText.value))
               {
                   return;
               }
               if(re1.test(oText.value))
               {
                   oText.value=this.innerHTML;
               }
           }
           //符号部分的添加
           for(var j=0;j<aPer.length;j++)
           {
               aPer[j].onclick=function()
               {
                   if(oText.value&&oPer.value&&oText1.value)
                   {
                       var n=eval(oText1.value+oPer.value+oText.value);
                       oText.value=n;
                       oText1.value='';
                   }
                   oPer.value=this.innerHTML;
               }
           }
           //点击等号的时候
           oDeng.onclick=function()
           {
               //+-*/%的情况
               if(oText1.value==''&&oPer.value==''&&oText.value=='')
               {
                   return;
               }
               var n=eval(oText1.value+oPer.value+oText.value);
               oText.value=n;
               oText1.value='';
               oPer.value='';
               bClear=true;
           }
           //点击开根号的时候
           oSq.onclick=function()
           {
               var m=Math.sqrt(oText.value);
               oText.value=m;
           }
           //点击倒数的时候
           oRec.onclick=function()
           {
               var a=1/oText.value;
               if(oText.value=='0')
               {
                   a='正无穷'
               }
               oText.value=a;
           }
           //正负号的时候
           oZheng.onclick=function()
           {
               if(oText.value>0)
               {
                   oText.value=-oText.value;
               }
               else
               {
                   oText.value   =-oText.value;
               }
           }
           //清屏的时候
           oClea.onclick=function()
           {
               oText.value='0';
               oText1.value='';
               oPer.value='';
           }
       }
   }
   //on时
   oOn.onclick=function()
   {
       bOnOrOffClick=true;
       fnNum(bOnOrOffClick);
   }
   //off时
   oOff.onclick=function()
   {
       bOnOrOffClick=false;
       fnNum(bOnOrOffClick);
       oText.value='';
   }
}
</script>
</head>
<body>
<div class="calBox">
    <div class="calu">
       <input type="text" id="text">
        <ul class="one clearfix">
            <li class="orange on">开机</li>
            <li class="orange off">关机</li>
            <li class="orange clea">清屏</li>
            <li class="black zheng">+/-</li>
            <li class="black rec">1/x</li>
            <li class="num">7</li>
            <li class="num">8</li>
            <li class="num">9</li>
            <li class="gray oper">/</li>
            <li class="black oper">%</li>
            <li class="num">4</li>
            <li class="num">5</li>
            <li class="num">6</li>
            <li class="gray oper">*</li>
            <li class="black sq">√</li>
            
        </ul>
        <div class="clearfix">
            <div class="twoBox fl">
               <ul class="one fl two">
                    <li class="num">1</li>
                    <li class="num">2</li>
                    <li class="num">3</li>
                    <li class="gray oper">-</li>
                    <li class="zero num">0</li>
                    <li class="num">.</li>
                    <li class="gray oper">+</li>
                </ul>
            </div>
            <ul class="one three clearfix fl">
                <li class="black deng fl">=</li>
            </ul>
        </div>
    </div>
</div>
<input type="text" id="per" style="display:none">
<input type="text" id="text1" style="display:none">
<div style="text-align:center;clear:both">
</div>
</body>
</html>

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